Charles edwin funk



GQE. PUNK.`

(No Model.)

PUMP.

Patentedan. 23, 1894.

ms Nlmonu. LIYHDGMPNINB column' IINTTnn STATES CHARLES EDWIN FUNK, OFCHICAGO, ILLINOIS.

PUMP.

SPECIFICATION forming part of Letters Patent No. 513,315, dated January23, 1894.

Application filed March 7, 1893. Serial No. 465,023. (No model'.)

T0 all whom it may concern:

Be it known that I, CHARLES EDWIN FUNK, of Chicago, in the county ofCook and State of Illinois, have invented certain new and usefulImprovements in Pumps; and I do hereby Va cylindrical casing, an elastictube within the casing adjacent to the outer wallof the same and havinginlet and outlet ends extending out of the casing, and atraveling'pressure device affordinga moving pressure on the elastic tubeand serving thereby to force a continuous stream of iiuid through thesaid tube. As is well known, the suction of such pumps depends upon theelasticity of the walls of y the tube whereby said tube, after beingflattened by the traveling pressure device, tends to resume its normalshape and to thus afford a vacuum into which the fluid rushes from thesource of supply. Obviously, then, in order to get a strong suction thewalls of the tube mustbe of considerablethickness in-order that they mayhave a powerful tendency to resume their normal shape after beingfiattened, it being evident that a very thin tube would not resume itstubular form at all but would remain flattened after the first passageof the traveling pressure device, and render the pump entirelyinoperative.

Heretofore in the construction of pumps of this character the elastictube has been provided by bending a piece of ordinary tubing to conformto the curve of the casing and then inserting it within said casing.This method of construction necessitates either the use of a smaller andthinner tube than is required to secure a pump of maximum efflciency,orthe employment of a casing of large diameter in proportion to thediameter of the tube. The reason for this lies in the well known factthat the bending of a tube compresses the material on the inner side ofthe bend and elongates that upon the outside of the bend with the resultofl lessening, to a greater or less extent, the capacity of the tube toresume its normal shape after being compressed, accordingly assaid bendis more orless sharp. Consequently if the casing is made of i consequenttendency of that portion of the wall to expand toward the outer side ofthe bend in order to relieve the compressive tension on said inner wallof the tube, will readily respond to the outward pressure of thetraveling pressure device as it acts to flatten said tube, but will havebeen deprived of much of its natural resilientaction tending to forciblyrestore the tube to its circular crosssection and consequently thesuction of the pump will be greatly weakened. It will be evident alsothat, in a construction of this kind, the thicker the wall of the tubein proportion to its diameter, the greater the compressive tension ofthe wall on the inner side of the bend and, consequently, the greaterthe loss in the effective suction of the pump.

One object of my invention, therefore, is to provide a constructionwhereby,with an outer casing of relativelysmalldiameter, a relativelylarge size and thickness of tube may be used and yet the inner circularcross-section and the resilient action tending to restore suchcross-section, after the flattening by the traveling pressure device, benormally maintained unimpaired. To this end, therefore, I provide theelastic tube by molding it originally in the bent shape to which it mustnormally conform when in the casing, and thus, however large and thickit may be, it is not distorted by being inserted within'said casing andwill retain its maximum resilience when in such position.

vMy invention embodies also certain other features of improvement, aswill fully appear from the following description taken in connectionwith the accompanying drawings, in which- Figure l is a sectionalelevation of a pump embodying my invention. Fig. 2 is a similar viewtaken on line 2-2 of Fig. l. Fig. 8 isa partially' sectional Viewshowing the traveling pressure device out of operative position. Fig. etis a perspective detail.

In the drawings A designates the cylindrical outer casing of the pump, Btheelastic tube within ther same, and C the traveling pressure devicefor affording a moving pressure on the elastic tube. Said casing iscom.- posed of sheet metal or other suitable material, and as anadvantageous and convenient construction is herein shown as ma'de in twosections A' and A2 each comprising a fiat circular wall A3 A4 and amarginal cylindric Wall A5 A6; the cylindric wall A5 of the section Abeing sufficiently smaller in diameter than the cylindric Wall A6 of thesection A2 to readily,"

though tightly, slip within the same, in the manner illustrated. Theouter section A2 thus forms a cover for the inner section A',

and said outer section `is herein shown as provided with a rigidlyattached and radially extending handle A7 by which the pump may beconveniently supported.

The `elastic tube B is located in the interior of the casing adjacent tothe cylindric wall `thereof a'nd, to prevent the distortion which (ashereinbefore explained) results from bending 4a tube on a short radius,is originally molded in the curved shape to which it must conform whenso placed within the casing. Thelmaximum resilience ofthe tube tendingto restore it toits normally circular cross section after beingflattened by the traveling pressure device is thus maintained `and I amthereby further enabled to form said tube B with a wall of greatthickness relatively to its internal diameter (said wall being, in thisinstance, of a thickness greater than one-half of said diameter) andthus provide a powerful suction in the pump. Said tubev B, as lhereinshown, extends completely around the interior of "the casing, butitsinlet and outlet ends B and B2 instead of lapping by each other andthus necessitating the use ofa casing having a width double the exteriordiameterofthe tube, are turned outward in close proximity to each otherand pass out of the casing through registering openings a and a in thecylindric walls A'and A6 of the casing sections A and A2 respectively.Obviously, however, said inlet and outlet ends might 'pass out of thecasing through the side walls thereof, if so desired. l

As a convenient and advantageous construction that portion of the tube`within the casing is herein shown as molded in the form of a continuousring with the inlet and outletends B and B2 leading ott radially fromadjacent points on its outer side, a transverse partition BB beingprovided in the interior of thetube between the adjacent ends B and B2in order to prevent any communication between them except through thefull length of the ring. Said partition Ba is herein shown as arrangedobliquely in aplane parallel with the axis of `rotation of the roller Cin order thatit may offer as little obstruction as possible to thepassage of said roller. The ends B and B2 are adapted to be connected byany suitable pipe couplings b b with the source of supply and discharge.

The revolving pressure device C is herein shown as comprising a roller Crotatively supported on a transverse pin c extending between the outerends of radial` arms C2, the inner ends of which are mounted uponashaftD journaled in the sidewalls of the cylindric portion of the casing andat the centerthereof. A crank E and handle E furnish, inthis instance, aconvenientmeans of rotatingsaid shaft and pressure roller. Theattachment between the inner ends of the radial arms C2 and the shaft Dis herein shown of such nature as to provide for the automatic radialadjustment of the roller C into operative position as the operatorbegins to turn the crank E and out of operative position as said crankis released. To this end the portion Dof the shaft D withinthe casing isformed eccentric to its end or journal `portionsD2andtheinner ends ofthe radial arms C2 are provided with an integral sleeve CB fitting said`eccentric portion `and adapted .to have a rotary movementthereon, saidmovement ,beinglimited by the engagement of `apin orstudolprojectingradially ,from one `endof `,the-eccentric portionD of the shaft D, `withthe ends of a stop c fixed on the adjacent radialarm VC2. Said stop c isof such length andthe pin dis so located on the eccentric portion of`the shaft that when saidpin is inengagement with eitherlendof saidstop-the roller 1C will be thrust out far enough toltlatten the elastictube, as shown'in Fig. 1, while when said pin standsmidway between `theendsof 4the stop theroller willbebarely in contact with the tube and thelatter will be freeto 4resume Aits normal circular cross -section. Withsuch construction itwill be obvious that `the resilience of the rubberwill ynormally maintain therollerinitsinnermostposition. Theturning ofthe crank E will, therefore, notimmediatelyrevolvethe pressureroller C`but will tirst rotate-the shaft D in the sleeve so as to force saidroller against thetube until thellatter is pressed flat, after which thepin d will engage the end of the stop c and cause theradial armsandroller to rotate with the crank and thus operate the pump. Whengthecrankis released the resilience of the elastic tube will force the rollerback into `the position shown in Fig. 3, the reaction of the sleeve onthe eccentric portion of the shaftcausing the crank to tl y back farenough to permit such inward movement of the roller. Turning of `thecrank in the other direction will, in an exactly similar manner, bringthe 'pin into engagement with the other `end of the stop and force aconstantfstreamof liuid through the tube-ina reverse direction.

As hereinfshownthe stop c is yprovidedgby setting the adjacent radial4arm C2 slightly back from theendof the'sleeve and cutting away said endto the desired extent. The opposite end ofthe sleeve is also hereinshown as formed in a similar manner with afstop c2 similar tothe stop cbut of dierent length, and it Willbe obvious that by reversing thesleeve so as to bring the stop c2, instead of the stop c', into positionfor engagement with the pin d the roller C may be made to engage thetube B with a dierent degree of pressure.

Outwardly projecting sleeves a2 and a3 on the side, walls of the casingsections A and A2 respectively, afford a sufficient length of bearingfor the journals Dg of the shaft and, as herein shown, the crank E issecured to the end Dsof the shaft adjacent to the sleeve d2; said end D3being screw-threaded for engagement with said crank and being providedwith a jam nut cl2 for securing said crank in position. In this instancea washer cl3 is shown as inserted between the crank and the sleeve a2.The other end D4 of the shaft is also shown screw-threaded and isprovided with a nut d4, in this instance a thumb nut, normally engagingthe outer face of the sleeve a3 and serving to bind the sections Al andA2 of the casing together. As herein shown the opening ctin thecylindric wall A6 of the section A2 is provided in the form of a recessopen at one side so that said section may be withdrawn from the innersection A without interfering with the outlet and inlet ends B and B2.

From the foregoing construction it will be obvious that by removing thethumb nut d4, the inner section A and with it the entire operatingmechanism and elastic tube of the pump may be Withdrawn from the sectionA2 and that therefore the said operative mechanism will be convenient ofaccess for cleaning or for adjustment ofthe pressure device by thereversal of the sleeve Oaafter the manner hereinbefore described. I

The particular form of pump herein illustrated is more particularlyintended as a surgeons pump for the transfusion of blood, but pumpssimilarly constructed and embodying the same principles may obviously beused for other and various pumping purposes.

I claim as my inventionl. .A pump comprising a cylindric casing, anelastic tube within the casing provided with inlet and outlet passagesand a traveling pressure device for affording a movable pressure on theelastic tube, said tube being molded to conform to the curve of vthecylindric wall of the casing, substantially as described.

2. A pump comprising a cylindric casing, an elastic tube extendingaround the interior of the casing and provided with inlet and outletends extending out of the casing in proximity to each other, andatraveling pressure device, revolubly mounted at the center of thecasing for providing a movable pressure on the elastic tube, said tubebeing molded to conform to the curve of the cylindric wall of thecasing, substantially as described.

3. An improved pump comprising a cylindric outer casing, an elastic tubeextending around the interior of the casing adjacent to the cylindricWall of the same, said tube being molded in a continuous ring with atransverse partition across its interior and with outlet and inletpassages molded in piece with the ring on opposite sides of thepartition, and a traveling pressure device revolubly mounted at thecenter of the casing, substantially as described.

4. An improved pump comprising a cylindric outer casing, an elastic tubeextending around the interior of the casing adjacent to the cylindricwall of the same, said tube being molded in a continuous ring with atransverse partition across its interior and with inlet and outletpassages molded in piece with the ring on opposite sides of thediaphragm, said diaphragm being inclined or oblique, and

a traveling pressure device revolubly mounted 8o at the center of thecasing, substantially as' described.

5. A pump comprising a cylindric casingf an elastic tube withinthecasing, a shaft journaled at the center of the casing with its jouranelastictube within the casing, a shaft journaled at the center of thecasing with its journal portions eccentric to but Within the cylinder ofits middle portion, a projection at one end of said middle portion, aremovable sleeve inclosing said middle portion and provided at its endWith segmental stops of different lengths adapted to engage saidprojection, substantially as described.

7. An improved pump comprising a cylindric casing made of an outer andinner section each having a side Wall and a cylindric marginal Wall, thecylindric wall of the inner' section fitting within that of the outersection, an elastic tube Within the casing, a rotatable shaft journaledin the side Walls of the casing and having an eccentric portion, areversible sleeve embracing said eccentric portion and provided at itsopposite ends with stops of different lengths, a pin xed to the shaftfor engaging either of said stops, a pressure member fixed to the sleeveand adapted to engage the elastic tube, the engagement of the shaft withthe side wall of the outer section being detachable, whereby saidsection may be readily withdrawn to permit of 12o the reversal of thesleeve, substantially as described.

In testimony that I claim the foregoing as myinvention I affix mysignature in presence of two witnesses.

CHARLES EDW'IN FUNK.

Witnesses:

C. CLARENCE POOLE, HENRY H. CARTER.

IIO

